Machine for forming corrugated metal fasteners.



y E. S. NORTON & C. J. BERNDT. MACHINE FOR PORMING GORBUGATED METAL PASTBNERS. v APPLICATION FILED MAR. 19, 1912. u 1,070,282 Patented Aug. 12, 1913.1

4 SHEETS-SHEET 2.

, B. S. NORTON a C. J, BERNDT. MACHINE PoR 'FORMING GORRUGATED METAL PASTENBRS.

' APPLIUATION FILED MAR.1.9,1912. 1,070,282.`

Patented Aug. 12,1913.

1 SHEETS-SHBET 4.

i fren STATES PATENT onirica". i

ELLIOTT S. NORTON AND CHARLES J'. BERND'I, OF CHICAGO, ILLINOIS, ASSIGNORS TO ACME STEEL GOODS COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLI- NCIS.

MACHINE FOR FORMING- COREUGATED METAL FASTENERS.

Specification of Letters Patent.

` Patented Aug.`12,1913.

Application filed March l, 1912. Serial No. 684,898.V

To all 'whom it may concern.

Be it known that we, ELLro'r'r S. NORTON and CHARLES J. BERNDT, citizens of the United States,.residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Machines for Forming Corrugated Metal Fasteners, of which the following is a specification.

Such fasteners are commonly made by severing into suitable lengths a steel ribbon which has been previously corrugated and sharpened upon one edge. relates more particularly to a machine for corrugating and sharpening the edge of the steel ribbon. The article resulting from the machines and processes of manufacture heretofore adopted has been more or less defective in that, by reason of the operations by.

which it has been. formed the entering knife edge of the fastener is not smooth and sharp, but on the .contrary is irregular and turned or formed ,with a bur.V Our invention is a machine capable of producing in great quantity a corrugated strip of metal from which the fasteners may be formed, the strip having a smooth continuous cutting edge without bur or other irregularity. In our improved machine the strip is neither ground nor pressed to secure 'the required sharpness of cutting edge as in the machines of the prior art, but the corners of the cutting edge are chalnfered by planing or shaving knives past which the strip is drawn by means of crimping or corrugating rolls. In order to avoid any possible irregular, turned or wire edge, the material upon the sides of the cutting edge is removed by a series of cuts, the first of which forms the extreme edge or apex of the Istrip into a comparatively bl-unt angle, the second at a somewhat more acute angle to the plane of the strip,

' removes the material somewhat farther back from the extrci'ue edge of the strip, and the third and last cut made at an angle yet more acute with reference to the plane of the strip carries the chamfering nearly to the plane of the strip, all of which will appear more fully from an inspection of the accompanying drawings especially when taken with the detailed description below. The corrugating rolls in our machine are made to serve the furtherpurpose'of fur- Our invention l nislhing therdraft for drawing the strip of metal past the planing knives.

In the accompanying drawings we have shown a preferred embodiment of our inf vention and have detailed the same in the following detailed specification. It will be understood, however, that the disclosure of the specific form is only for the purpose of exempliiication andv that our invention is not limited thereto but its-,scope is set forth in the following claims.

In the drawings Figure 1 is Va plan view of the preferred form of our invention partly in section upon the line 1-'1 of Fig.l 2; Fig. 2 is a vertically longitudinal section upon the line 2-2 of Fig. vl; Fig. 3 is a plan view on an enlarged scale of the planing or shaving knives and their mountings; Figs. 4 and 5 are side elevations of the. same viewed from opposite sides of the machine; Fig. 6 is a central 'vertical section upon the line 6 6 of Fig. 3; Figs. 7 and 8 are front and rear end views respectively of the same portion of the machine, and Fig. 9 a vertical cross-section thereof upon the line 9-9 of Fig. 3;' Fig. 10 is a greatly enlarged crosssection'of` the edge portion of a stri as formed upon our machine; Fig. 11 is a ragmentary plan view of that portion of the machine in which the corrugating rolls are mounted; Fig. 12 is a vertical section of the same upon the line 12-12 of Fig. 11; Fig. 13 is an elevation partly broken away of the reduced entering end of a strip adapted to be operated upon by our machine, .and Fig. 14 is a perspective view of a metallic fastener, such as is formed by sub-dividing. the strips produced by our machine.`

Upon a suitable bench or support A are bolted a knife support and a roll housing C containing a pair of corrugating and draft rolls,the bite of which is in line with the axis of thev chamfering' o1 planing device. The latter consists of a stand l5 bolted to the bench at 16 and carrying at its upper end the strip guide and knife support` 17. 'The body of the latter consists of a generallyrectangular block having in the center of its upper face a kerf or deep channel 18 of a width to 'receive the strip fromwhich the corrugated fasteners are to be formed and of a somewhat greater depth, the lower 'portion of the korf or channel being enlarged by a rectangular offset 19, as clearly shown in Figs. 7, S and 9. If desired for conven ience of manufacture or other reason, the block 17 may be formed in a pluralitj7 of sections. The guide and knife support is secured to the stand by means of a plate 20 (see Figs. G and 9) which is screwed to the top of the standard l5 and also attached to the strip guide and knife support by the screws 2l. (See Fig. 6).

ln the enlarged lower portion l0 of the strip guiding channel is `inserted a coinparatively heavy backing bar 2l which supports the strip 22 when in the guide and is adjustable by means of the screws 23, 2l mounted in brackets E25-25 and operating against the projecting ends of the bar. By this construction the strip may be accurately adjusted to produce the desired depth of eut by the knives, Upon either side the strip guide and knife support is provided with a series of knife seats, three being shown upon each side1 and each consists in a channel or recess against the bottom of which the knife blade is clamped, the plane of the bottom being inclined and intersecting the kerf or strip guiding channel near its upper edge, and the walls of the recess are so spaced from each other as to tit the width of the blade and prevent edgewise movement thereof. The knife seats are staggered, as shown more particularly in Fig. 3, and inclined to the plane. of the strip guide or kerf at successively greater angles from the front to the rear of the machine, though if desired the members of each pair may be arranged at the same angle. The knives @(3-26 of the first pair are held to their respective seats by perpendicular bolts QT-QT which extend` through tapped holes in the supporting blocks Q8---28, the latter being bolted at 29 Q9 to the combined strip guide and knife support, and also cut away or relieved at QSL-28 to permit the shavings or chips to escape and facilitate uninterruptrul operation of the knife blades. The members 30--30, l-3l of the second 'and third pairs of planing knives are held to their seats by backing blocks 32)-32 bolted to the strip guide at 33--33 and provided with projections 343fl which enter the knife seat-s and bear upon the knives, their under faces being preferably formed to lie parallel with the bottoms of the knife seats when the backing blocks are bolted in place. It will be apparent that a strip of metal drawn through the korf or strip guide with its edge extendingl into or across the planes of the several pairs of knives is chanifered as shown in Fig. lt), the knives of the lirst. pair forming the extreme bevels 35 35, those of the secv ond pair the interniediate bevels 3G-2l(3, and those of the third pair the final bevels 37-37 in the order given. lt is to be observed also that the knives are forwardly inclined s0 that they have a tendency to force and hold the strip in firm contact with the backing bar.

Referring new more particularly to Figs. l, Q, ll and 1Q, illustrating the corrugating rolls, it will be seen that the housing C is bolted at 38 to the bench A, and formed with the horizontal cross members I35)40 in which the bearings of the corrugating rolls are mounted. For this purpose the cross pieces are slotted as at tl-*42, the slots being rabbeted at 43 4.4, and receiving the rectangular bearing blocks l5-4G for the arbor 4T of a stationary roll, and the adjustable bearing blocks 48---Ll9 for the arbor of the adjustable corrugating roll, all the bearing blocks being provided with shoulders 50-51 which coact with the rabbets 43-44 in the slots to prevent endwise displacement of the rolls or bearing blocks. Each of the eorrugating rolls .5253 is provided with suitable spacing collars 5ft-55 56 and 57 and with one of thecollars 5S which is freely revoluble upon the arbor of the adjustable roll, the inner head 59 of a screw (50 extending through an upright of the housing at (il engages, to adjust the bite or pass of the rolls. Upon its lower end, the arbor t7 of the stationary roll carries a bevel pinion G2 which meshes with a similar pinion 53 upon a stub shaft 6ft which carries at its outer end a gear 65 meshing with a gear 66 upon the power shaft (3T, a pulley (38 being mounted on the power shaft for driving the same from any suitable source of power.

ln order to start the operation of the machine upon a strip of metal the latter is somewhat `narrowed or cut away on its entering end as at D, Fig. 13 in order that itmay be inserted by hand through the strip guide. without interference by the knives and drawn into the bite of the eorrugating rolls. lVhen this has been donc the rolls draw the strip tl'irough the machine and the knives operate upon it successively as heretofore eX- plained.

rl`he operation of our invention is such that at a single pass therethrough the strip is sharpened and corrugated and by reason of the angular arrangement of knives adopted, the somewhat rounded or hipped cutting edge is formed without producing any burs, turned edge or other deforu'iat-ion, nothing` remaining to be done but to cut the strip into lengths. As shown in Fig. 1l the ult mate product is a short piece of corrugated sheet metal having a smoothly and continnordsee respectively inclined with respect to each other and the knife also inclined with relation to the length of the strip, and means for drawing the strip past the edge of the knife.

2. In a machine of the class described, a strip guide, a pair of knives the edges of which are oppositely inclined to the plane ofthe strip guide and alsowith relation to the length of the strip, said knives arranged to engage the adjacentcorners of a strip of metal in the strip guide, and means for drawing a flexible strip through the strip guide.

8. In a machine ofthe class described, a strip guide, a plurality of pairs of knives arranged along the strip guide with their cutting edges' at successively diminishing angles to the plane of the guide, and means for drawing a strip with relation to the knives.

Il. In a machine of the class described, a strip guide, knives arranged on opposite sides of the strip guide with their cutting edges in inclined position with respect to the plane of the strip guide to chamfer .the corners of a metal strip in the guide, and a pair of cor'rugating-rolls adapted and arranged to draw a strip with relation tothe knives.

5. In a machine of the class described, a strip guide having a channel for receiving a strip of metal to be chamfered, knives snpport-ed by and 'upon opposite inclined faces of the strip guide with their-cutting edges inclined to both the plane and length thereof, and means for drawing the strip through the guide.

5. vIn a machine of t-he class described, a strip guide having a strip receiving channel and inclined seats formed, on opposite sides of the strip channel, knives arranged in the seats with their edges inclined to the plane of said channel and in position to' chamfer the edges of a strip in the guide, and means for drawing a strip through the channel.

7. In a machine of the cla-ssdescribed, a strip guide having a strip receiving channel, pairs of knife seats arranged along the strip guide, the seats of successive pairs being arranged at diminishing angles with relation to the plane of the strip channci, means for securinglniives in the seats, and means for drawing a strip through the channel.

8. In a machine of the class described, a stripvgnidc having a strip receiving channel therein, an adplstable backing bar within the strip channel, knives'arranged on opposite sidesof thestrip channel with their cutting edges inclined to the plane thereof for chamfering the upper edge of a strip in said channel, and means for drawing a strip vthrough said channel.

9. In a machine of the class described a strip guide having a narrow channel formed in a vertical plane, inclined knife blades arranged on opposite sides of the channel with their edges in position to chamfer astrip passing through the channel, theplanes of the blades intersecting in the plane of the channel.

l0. Ina machine of the class described, a strip guide rectangular in cross section having a channel parallel to the sides thereof, knife seats formed in the guide the bottoms of which are :in planes inclined to each other and to the plane of the channel, knives in said seats, and means for securing said knives to the seats. v

1l. In a machine of the class described a strip guide rectangular in cross section having a channel parallel to the sides thereof, knife seats formed in the guide the bottoms of which are in planes inclined to each other and to the plane of the channel, and intersecting substantially in the plane of the channel, knives in the seats and means for securing the knives thereto.

12. In a machine ofthe class described a strip guide rectangular in cross section having a longitudinal strip channel parallel to the sides thereof,l knife seats formed in the guide the bottoms of which are in planes inclined to each other and to the plane of the channel, knives in the Seats, and blocks secured to the parallel sides of the guide having screws bearing upon and securing the knives on their seats.

13. In a machine of the class described a guide having a narrow channel extending longitudinally thereof, transversely extending, open ended, knife seats extending transversely of the guide and inclined to the plane of the channel thereof, and knives secured and longitudinally adjustable in .said seats whereby the operative portion of the cutting' edges may be changed.

ELLIOTT S. NORTON. CHARLES J. BERNDT.

lVitnesscs A,

(lr. O. LoNoMAN, THOMAS J. IIAIR. 

